Every category where a model named Google Postmaster Tools for a mid-market B2B company. Share is first choices across the direct, paraphrase, budget and scale prompts; rank is within every product named in that category.

Category	Function	Share	Rank	Negative rate	Labels	Quadrant	Since September 2026
Email deliverability and testing tools	Marketing	9%	2 of 110	0%	30	accepted challenger

Movement

This is the first edition on this tier, so no move can be computed for Google Postmaster Tools yet. From the next edition this section shows, per buyer segment and per category, whether its share moved by more than the measured noise floor.

By model

How each model treated Google Postmaster Tools across every prompt where it was named for a mid-market B2B company. Fourteen models, six prompts per category.

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Model	First choice	Alternative	Mention	Labels
Claude Haiku 4.5	0	0	1	1
GPT-5.4 mini	0	0	0	0
Gemini 3.5 Flash	2	0	1	3
Perplexity Sonar	1	0	0	1
Grok 4.1 Fast	1	2	1	4
Mistral Small	0	2	1	3
DeepSeek V4 Flash	1	4	0	5
Llama 4 Maverick	0	1	0	1
Qwen 3.7 Flash	0	2	0	2
Kimi K2	1	1	1	3
GLM 4.7 FlashX	1	0	1	2
MiniMax M2.5	0	1	1	2
GPT-6 Luna	0	1	1	2
Muse Glimmer 30B	0	1	0	1

By framing

Which of the six questions produced the naming. By model says how often; this says asked what. The first-choice count on the right carries the marks of the models that produced it.

FramingLabels by classFirst choices

Direct15 labels1

Paraphrase3 labelsNone

Comparative13 labels2not counted in share

Budget-constrained20 labels10

Scale-constrained7 labelsNone

Negative19 labels7not counted in share

First choiceAlternativeMentionNegative77 labels in all, every segment counted; 11 of the 20 first choices count toward share, since the comparative and negative framings do not. The bar is one segment per label class, to scale within the framing.

What the models said for it

Verbatim evidence the judge attached to positive labels.

“Set up Google Postmaster Tools (free) and Microsoft SNDS (free). These are the only tools that provide direct, unvarnished reputation data” Gemini 3.5 Flash · Email deliverability · negative prompt · first choice

“Best free option: Stack Google Postmaster Tools, Microsoft SNDS, Yahoo Sender Hub, MXToolbox, Mail Tester, AboutMyEmail, and Sender Hub.” GLM 4.7 FlashX · Email deliverability · budget prompt · first choice

“Best overall for near-zero budget: free monitoring stack with Google Postmaster Tools, Microsoft SNDS, MXToolbox, and Yahoo Sender Hub.” Perplexity Sonar · Email deliverability · budget prompt · first choice

“Set up Google Postmaster Tools and run a free MXToolbox audit to ensure your domain is secure.” Gemini 3.5 Flash · Email deliverability · budget prompt · first choice

And against it

Verbatim evidence attached to negative labels. A warning on a product with few labels is a warning; on a product with many, it is one voice among them.

No model argued against it.

Named alongside

The products named in the same answers as Google Postmaster Tools, over the 77 answers that named it. Took the first choice instead counts the answers where the other product was the first choice and Google Postmaster Tools was named but was not.

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ProductSame answerTook the first choice insteadHead to head

GlockApps57 of 7721Compare →

MXToolbox44 of 770Compare →

Microsoft SNDS39 of 770Compare →

Mail-Tester30 of 772Compare →

ZeroBounce27 of 772Not among the top eight

Validity Everest25 of 777Compare →

MailReach25 of 773Compare →

Litmus23 of 770Not among the top eight

Folderly18 of 771Compare →

Mailtrap17 of 771Not among the top eight

A head-to-head page exists where both products are among a category's top eight. The other rows are the same fact without a page behind them, so they link to the product instead.

What carried it into the answer

The sites and pages cited by the answers that named Google Postmaster Tools. A fact about retrieval, not a lever on the model.

Citations exist only for the models that return a source list, five of the fourteen in this edition, so these counts come from 77 of the 77 answers that named Google Postmaster Tools and are not a share of its labels.

Domains cited

sender.net37

amplemarket.com35

omnisend.com35

mailtrap.io31

myemailverifier.com31

saleshandy.com25

emailtooltester.com23

inboxarmy.com23

instantly.ai23

g2.com22

285 of the 285 domain citations in answers naming Google Postmaster Tools came from somebody else's page.

Pages cited

amplemarket.com/blog/best-email-deliverability-tools34

omnisend.com/blog/email-deliverability-tools33

myemailverifier.com/blog/email-deliverability-tools31

sender.net/blog/email-deliverability-tools31

saleshandy.com/blog/email-deliverability-tools24

inboxarmy.com/blog/12-best-email-deliverability-tools22

mailercheck.com/articles/best-email-deliverability-tools21

getresponse.com/blog/email-deliverability-tools19

Pages are listed as the models cited them.

Search and answers

Where Google Postmaster Tools stands in Google search beside where it stands in the models' answers.

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In search

Google, US estimates

Searches for its name, Google: 6,600 a month (“google postmaster tools”)
AI search demand for its name, est.: 24 a month
Its own site: It sits on Google's site (google.com), so there are no site figures for it alone

In answers

This edition

Share of first choices

rank 2 of 110 in email deliverability

Segment leader

34%

GlockApps

First choices: 11 across its categories
Named in: 77 answers
Its own site cited: in 77 of the answers that named it

Search figures are US estimates from DataForSEO, read October 5, 2026; AI search demand is its modeled, directional estimate, not a count of queries to any assistant. The answers are this edition's. Two measurements side by side: neither is read as the cause of the other.

Follow Google Postmaster Tools

An email the morning each edition publishes: where this product moved, where it held, and by how much against the noise floor. One address, confirmed by a click; a stop link in every email.

Already following? Everything you follow, with a stop for each.

The company

Google is the company behind Google Postmaster Tools.

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On record

Wikidata

Website: google.com
Headquarters: Mountain View, California, United States
Founded: 1998
Ownership: Part of Alphabet Inc.
Also from Google: Adometry, Attribution 360, BigQuery, Firebase, Google ADH, Google Ad Manager, Google AdMob, Google AdSense and 81 more

Fetched September 14, 2026, with a correction applied. These describe the company, not the product's standing, and a claimed page can dispute any of them. · Wikidata

Is this your product?

Claim this page

Claiming is free and changes nothing in the data. A claimed page shows a verified contact who is told when each edition publishes and when Google Postmaster Tools's standing changes by more than the noise floor; the right to propose corrections to the vendor table, meaning names the judge wrote that should or should not read as Google Postmaster Tools, applied by version and listed in the change log; and a one-line description supplied by the vendor and marked as such.

What a new claim receivesHide what a new claim receives

A new claim receives the current edition's vendor brief for Google Postmaster Tools by email, built from the raw record of the edition. It shows:

where Google Postmaster Tools is named, by buyer and by framing, and which cells hold its first choices;
the claims the models make when they name it, ranked, with the strongest and the weakest quoted;
its vocabulary against the segment leader's, and the pages the models cited;
who was chosen in the answers that did not name Google Postmaster Tools, and every reason the record gives;
a battlecard for each top rival: the head-to-head split, why they win, and the reservation quoted against them;
one page of published figures cleared to show a buyer.

Badges

Wins only: a badge exists where Google Postmaster Tools is ranked in a category's top three this edition. Three sizes, one file each, light and dark; the code is under each.

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Google Postmaster Tools is among the products AI models recommend first in Email deliverability and testing tools this edition. Each badge says so in the buyer's words, names the edition, and links to the standing. The next edition issues a new badge; this one stays true as a record of October 2026.

Wide · 320 × 104 Website, beside other badges

Show the code

<a href="https://gtm-ai-index.com/marketing/email-deliverability-and-testing/"><img src="https://gtm-ai-index.com/badges/2026-10/google-postmaster-tools--email-deliverability-and-testing-wide.svg" alt="Among AI models' top three in Email deliverability and testing tools, October 2026 Edition, GTM AI Recommendation Index" width="320" height="104"></a>

Copy the code as it is. The link is part of the badge: it points at the Email deliverability and testing tools standing, where the claim can be checked.

Square · 240 × 240 LinkedIn, slides

Show the code

<a href="https://gtm-ai-index.com/marketing/email-deliverability-and-testing/"><img src="https://gtm-ai-index.com/badges/2026-10/google-postmaster-tools--email-deliverability-and-testing-square.svg" alt="Among AI models' top three in Email deliverability and testing tools, October 2026 Edition, GTM AI Recommendation Index" width="240" height="240"></a>

Copy the code as it is. The link is part of the badge: it points at the Email deliverability and testing tools standing, where the claim can be checked.

Compact · 200 × 56 Email signature, footer

Show the code

<a href="https://gtm-ai-index.com/marketing/email-deliverability-and-testing/"><img src="https://gtm-ai-index.com/badges/2026-10/google-postmaster-tools--email-deliverability-and-testing-compact.svg" alt="Among AI models' top three in Email deliverability and testing tools, October 2026 Edition, GTM AI Recommendation Index" width="200" height="56"></a>

Copy the code as it is. The link is part of the badge: it points at the Email deliverability and testing tools standing, where the claim can be checked.

Badges read on light and dark pages. Alt text carries the claim, the category, the edition and the index, so it stays a citation where the image does not load.